Metavoltine Mineral Data

General Metavoltine Information

Chemical Formula:

K4Na4(Fe++,Zn)Fe+++6(SO4)12O2•20(H2O)

Composition:

Molecular Weight = 2,189.12 gm

Potassium 7.14 % K 8.61 % K₂O

Sodium 4.20 % Na 5.66 % Na₂O

Zinc 1.49 % Zn 1.86 % ZnO

Iron 16.58 % Fe 1.64 % FeO / 21.88 % Fe₂O₃

Hydrogen 1.84 % H 16.46 % H₂O

Sulfur 17.58 % S 43.89 % SO₃

Oxygen 51.16 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₄Na₄Fe²⁺_0.5Zn_0.5Fe³⁺₆(SO₄)₁₂O₂ï¿½20(H₂O)

Environment:

Volcanic exhalations.

IMA Status:

Valid Species (Pre-IMA) 1883

Locality:

From Vesuvius and Cape Miseno, near Naples, Italy. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for "with" and voltine, because is was found associated with voltaite at the original locality.

Name Pronunciation:

Metavoltine + Pronunciation

Synonym:

ICSD 8270

PDF 29-1043

Metavoltine Image

Images:

Metavoltine Alunogen

Comments: Yellow metavoltine with white alunogen.
Location: Carola Mine, Freital, near Dresden, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Metavoltine Crystallography

Axial Ratios:

a:c = 1:1.89523

Cell Dimensions:

a = 9.545, c = 18.09, Z = 1; V = 1,427.32 Den(Calc)= 2.55

Crystal System:

Trigonal - Rhombohedral H-M Symbol ( 3) Space Group: P 3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.08(1), 18.2(0.8), 2.018(0.4),

Physical Properties of Metavoltine

Cleavage:

{0001} Perfect

Color:

Greenish brown, Yellow brown, Orange brown, Lemon.

Density:

2.5

Diaphaneity:

Transparent to translucent

Habit:

Scaly - Morphology like fish scales.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5 - Finger Nail

Luminescence:

Non-Fluorescent.

Luster:

Resinous

Streak:

brownish yellow

Optical Properties of Metavoltine

Dichroism (e):

light yellow or pale greenish yellow.

Dichroism (w):

dark yellowish brown or dark yellowish brown.

Gladstone-Dale:

CI meas= 0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.03 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2291,KPDmeas= 0.2337,KC= 0.2362
Ncalc = 1.59 - 1.6

Optical Data:

Uniaxial (-), e=1.573-1.581, w=1.588-1.595, bire=0.0140-0.0150.

Calculated Properties of Metavoltine

Electron Density:

Bulk Density (Electron Density)=2.50 gm/cc
note: Specific Gravity of Metavoltine =2.50 gm/cc.

Fermion Index:

Fermion Index = 0.0057029967
Boson Index = 0.9942970033

Photoelectric:

PE_Metavoltine= 7.42 barns/electron
U=PE_Metavoltine x r_electron= 18.58 barns/cc.

Radioactivity:

GRapi = 103.23 (Gamma Ray American Petroleum Institute Units)
Concentration of Metavoltine per GRapi unit = 0.97 (%)

Estimated Radioactivity from Metavoltine - barely detectable

Metavoltine Classification

Dana Class:

29.04.06.01 (29)Hydrated Acid and Sulfates

(29.04)where (A+)2 Bn (XO4)p ï¿½ x(H2O)

(29.04.06)Dana Group

29.04.06.01 Metavoltine K4Na4(Fe,Zn)Fe6(SO4)12O2•20(H2O) P 3 3

Strunz Class:

07.DF.35 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DF -With large and medium-sized cations

07.DF.35 Metavoltine K4Na4(Fe,Zn)Fe6(SO4)12O2•20(H2O) P 3 3

Other Metavoltine Information

References:

NAME( Dana8) PHYS. PROP.(Dana8:Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Metavoltine :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Metavoltine Specimen Label here :

Metavoltine

K4Na4(Fe++,Zn)Fe+++6(SO4)12O2•20(H2O)
Dana No: 29.04.06.01 Strunz No: 07.DF.35
Locality:

Notes:

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